The trial will consist of two parts. To initiate the trial a pilot study (part 1) will be performed to determine the feasibility in our setting at Aarhus University Hospital as it is described in the literature. Consecutive patients will be enrolled in the pilot study during 1-year period. The interim analysis after one year of enrollment will be performed to determine what patients are most likely to benefit from functional radiotherapy planning based on SPECT. The main objective of this part is to determine whether V/Q-SPECT data are valid and usable in the radiotherapy planning. The timing for acute and late follow-up SPECT will be determined. Randomized trial (part 2) will be performed thereafter.